Hi and welcome from Carnoustie
My advice would be start with the pigs as they will help to clear the land. Buy weaners and fatten them - it's quick and relatively easy. You will need very good boundary fences but you'll need that for any stock, but you'd be able to use electric to divide the area up, if it's not a disaster if they escape to another bit of the land.
Once the pigs have cleared the land, you will be able to cultivate and reseed it with grass.
How much land do you have? Is it waste land or just overgrown pasture?